Control method and control system for finished product cabin material conveying trolley of asphalt mixing station

Abstract

The invention discloses a control method and a control system for a finished product cabin material conveying trolley of an asphalt mixing station. Approach switches are respectively arranged at the original point and the middle point of a finished product cabin material conveying rail, when a finished product cabin material conveying trolley passes through the approach switch arranged at the original point of the material conveying rail, the interruption signals are generated, and the counting value of a pulse counter of a main controller is cleared; and when the finished product cabin material conveying trolley passes through the calibration approach switch arranged at the middle of the material conveying rail, the interruption signals are generated, and the pulse counter of the main controller is calibrated to the calibration pulse value. The speed change control strategy is adopted, and the precise stroke control is carried out on the finished product cabin material conveying trolley. The stroke control error increase phenomenon of the material conveying trolley caused by zero point accumulation errors of an increase type rotary encoder is eliminated, and the automatic error correction of the material conveying trolley is realized, so the finished product cabin control system is in stable operation for a long time. The control method and the control system have the advantages that the common fault diagnosis and processing in the finished product cabin material conveying trolley in the operation process are realized, and the probability of accidents caused by detection and control fault can be effectively reduced.

Description

technical field [0001] The invention relates to the field of industrial automation control, in particular to a method and a corresponding control system applied to an asphalt mixing station for controlling a trolley for transporting materials in a finished product warehouse. Background technique [0002] Asphalt mixing plant is the necessary equipment for high-grade highway construction units in road construction. The purpose of the asphalt mixing plant is to produce asphalt concrete. Its main function is to mix asphalt, gravel, and cement together according to certain gestures, heat it to 150 degrees at a high temperature, and then pave it on the highway under construction with paver. [0003] The early product warehouse control system of asphalt mixing plant mostly used electromagnetic speed regulation, cam stroke control winch system or hydraulic winch control system. [0004] Electromagnetic speed regulation and cam stroke control have the following technical problems: ...

AI Technical Summary

Problems solved by technology

[0004] Electromagnetic speed regulation, cam travel control The following technical problems exist in the finished product warehouse material transport trolley: using mechanical stroke control and braking, it is easy to fail to control the finished product warehouse material transport trolley stroke due to the failure of the mechanical component detection and control function

[0005] There are the following technical problems in the control of the finished product warehouse material trolley by the hydraulic hoist: mechanical stroke control and braking are used, and it is easy to fail to control the finished product warehouse material trolley stroke due to the failure of the mechanical component detection and control function

However, due to the cumulative error of the zero point of the incremental encoder, the long-term operation, the stroke control error of the transport trolley caused by the cumulative error of the zero point of the incremental rotary encoder will continue to expand, resulting in the inability to unload the finished material into the designated finished product warehouse.

In addition, there is a general lack of common fault diagnosis and treatment methods during the operation of the finished product warehouse delivery trolley, which is prone to serious accidents such as loss of control of the delivery trolley

[0007] To sum up, the current finished product warehouse control system of asphalt mixing plant has the following technical problems: 1. The stroke control of the finished product warehouse trolley is not accurate, and the finished material cannot be unloaded into the designated warehouse

2. Lack of diagnosis and treatment of common faults during the operation of the finished product warehouse material trolley, which is prone to serious accidents such as the loss of control of the material delivery trolley

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